Garrus - Eye for an Eye part 1

First things first -- to undertake this optional quest, you're going to want to find Garrus on board the Normandy. He can be found in his usual location, on the third floor, near the main batteries. When you arrive, he'll explain to Shepard that he has something on his mind. Notably, that "something" is actually a "someone" named Sidonis. Sidonis and Garrus used to work together, post-Normandy, when they were commando-ing around the galaxy together. However, Sidonis is an untrustworthy rat, and people perished because of what he did (and didn't do). He used someone called Fade to hide himself away following his operations with Garrus, but Garrus hasn't forgotten. As he explains to Shepard, he wants to find Sidonis and seek retribution on him, Hammurabi style.

To find Fade, and to begin to track down Sidonis himself, you're going to have to head to, of all places, the Citadel. If you're following this walkthrough to a tee, and we hope that you are, then you would have already went to the Citadel. This is good, since we thoroughly explored it. So, all that's left to do once we arrive there is to get on with our quest, without ancillary distractions all around us. But of course, we have to get there first. To do so, head to the Serpent Nebula via the galaxy map. You'll be brought to an area called Widow, where the Citadel can be found. Drive the Normandy to the Citadel, and land her on the giant, ancient space station to continue on with our quest.

As we mentioned earlier, you should have been to the Citadel already, so there will no distractions here. We're here to do nothing else but help Garrus. To do so, however, you'll have to think back to when we first came to the Citadel, very early on in the game, to visit with our old friend Anderson. When we arrived, we explored. And when we explored, we found a location on the far western edge of the map called Warehouse. This was an interesting, sketchy location, and we told you to keep it in the back of your mind for later. While we couldn't find anyone to speak with there earlier, that's where things are going to go down here. So, once on the Citadel, work your way to the far western edge of the map, and enter the now-active Warehouse to proceed.

When you arrive at the Warehouse, you're going to find a couple of Krogan mercenaries, along with a Volus. It's the Volus who you want to speak with here, though this will all happen automatically once you arrive, via a cutscene. You assume this Volus is Fade, but in fact, he's not. He just works for Fade... as an agent... kind of. While he can make people disappear, making them reappear is far more complicated. But when guns are drawn, and the Volus' hired Krogan guards mutiny, there's little left for him to do. He turns you on to a man named Harkin, who is hiding out nearby, in another area of the Citadel. Harkin is, indeed, the Fade. The defenseless (and humorously sarcastic) Volus implores you to use a nearby cab stand, to reach the location where he is. So, leave the Warehouse once you regain control, use the transit location to the north of the Warehouse, and head on out.

When you arrive, you'll run into the Blue Suns, a mercenary group that the Volus told you was working with Harkin (you've now seen these guys countless times during your adventure). You'll also see Harkin himself, though he quickly bails through a door, and successfully flees for the time being. Now, it's time to fight. The two Blue Suns Troopers that initially assault you should be easy enough to fell with very little difficulty. Indeed, the battle shouldn't take longer than a few seconds. Once they're killed, you can then press through the door that Harkin just escaped through. However, once you go through the next door, you won't find him. Instead, you'll find a seemingly-abandoned office area. You can search a trash pile next to the door for some misplaced credits, as well as a medical kit behind the desk, if you're in need of some Medi-Gel. However, as you're doing all of this, expect to be attacked from the left by a few LOKI Mechs. Seek cover nearby and return the favor on these synthetic enemies, eliminating them quickly.